Carbon black pigment generally good for plastics coloring, can be selected according to the characteristic coloring or chemical properties of carbon black pigment, carbon black for coloring choices are basically with the blackness of the finished product must meet. Very fine carbon black pigment can be completed with black colouring of the particularly high requirements; PE garbage bags, plastic bags, cable material like products just medium level black degrees, can with than surface area lower, structure high of carbon black varieties; plastic color Shi, carbon black weighing and ingredients Shi appeared of tiny errors, are will led to obviously of chromatic aberration, so, should be used grain diameter larger, coloring force poor of low pigment carbon black, such carbon black dosage can slightly big, weighing errors relative small some, and has dispersion better, and price lower of advantages.